It is currently Thu Mar 28, 2024 6:23 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
Offline
 Post subject: Han Sanghoon, 8p - Lee Donghoon, 9p, White to play
Post #1 Posted: Fri Aug 02, 2019 8:23 am 
Gosei

Posts: 1733
Location: Earth
Liked others: 621
Was liked: 310
White to play. Attack the black group in the lower middle for profit.

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X . . . . X . . . . . . X . . . . . |
$$ | . O X X X X . O . X O X O X . . . . . |
$$ | . O O O X O O . O O . O O X . X . . . |
$$ | . X O . O O . . . X O . X O . . X . . |
$$ | X . X O X O . . . . . . X O . O O X . |
$$ | . X O O . . . . . . . . X O X X . . . |
$$ | . . . . . . . . . . . O X X O X X X . |
$$ | . X . O . . X . . O . O X . O . O . . |
$$ | . . X , . X . . O , X O O . O O X . . |
$$ | . X O . X . . . . . X X . X O X O O . |
$$ | . X X O . . . . . O X . X . O . O X . |
$$ | . X O . . . . . . O O X . X O O X . X |
$$ | . . . . . . . . . O X X X . O X X X . |
$$ | X X X . . . . . . O X O O O O . . . . |
$$ | X O O O . O O . . , X X O . O , X . . |
$$ | O O . . . O X X . X X . X O X X . X . |
$$ | . . . . . O O X . . . X O O O X O . . |
$$ | . . . . . . . . . . . O . O . O . O . |
$$ ---------------------------------------[/go]


Han Sanghoon, 8p - Lee Donghoon, 9p, B+R (Komi 6.5)
21st Nongshim Cup, Korean preliminary, 2019-07-26


The move at a by Han Sanghoon seems not to be the best option.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X . . . . X . . . . . . X . . . . . |
$$ | . O X X X X . O . X O X O X . . . . . |
$$ | . O O O X O O . O O . O O X . X . . . |
$$ | . X O . O O . . . X O . X O . . X . . |
$$ | X . X O X O . . . . . . X O . O O X . |
$$ | . X O O . . . . . . . . X O X X . . . |
$$ | . . . . . . . . . . . O X X O X X X . |
$$ | . X . O . . X . . O . O X . O . O . . |
$$ | . . X , . X . . O , X O O . O O X . . |
$$ | . X O . X . . . . . X X . X O X O O . |
$$ | . X X O . . . . . O X . X . O . O X . |
$$ | . X O . . . . . . O O X . X O O X . X |
$$ | . . . . . . . . . O X X X . O X X X . |
$$ | X X X . . . . . . O X O O O O . . . . |
$$ | X O O O . O O . . , X X O . O , X . . |
$$ | O O . . . O X X . X X . X O X X . X . |
$$ | . . . . . O O X . a . X O O O X O . . |
$$ | . . . . . . . . . . . O . O . O . O . |
$$ ---------------------------------------[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Han Sanghoon, 8p - Lee Donghoon, 9p, White to play
Post #2 Posted: Fri Aug 02, 2019 12:04 pm 
Judan
User avatar

Posts: 5539
Location: Banbeck Vale
Liked others: 1103
Was liked: 1456
Rank: 1D AGA
GD Posts: 1512
Kaya handle: Test
I'd play J4, which according to my reading, threatens the follow up at N9, after which the black group has only one solid eye at N7, and possible eye at the bottom that depends on black winning a ko.
This is not a pleasant ko for black, for white has an internal ko threat at O8, and large external threats at D9 then E11, and Q15.

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X . . . . X . . . . . . X . . . . . |
$$ | . O X X X X . O . X O X O X . . . . . |
$$ | . O O O X O O . O O . O O X . X . . . |
$$ | . X O . O O . . . X O . X O . C X . . |
$$ | X . X O X O . . . . . . X O . O O X . |
$$ | . X O O . . . . . . . . X O X X . . . |
$$ | . . . . . . . . . . . O X X O X X X . |
$$ | . X . O C . X . . O . O X . O . O . . |
$$ | . . X , . X . . O , X O O . O O X . . |
$$ | . X O C X . . . . . X X 3 X O X O O . |
$$ | . X X O . . . . . O X . X C O . O X . |
$$ | . X O . . . . . . O O X S X O O X . X |
$$ | . . . . . . . . . O X X X . O X X X . |
$$ | X X X . . . . . . O X O O O O . . . . |
$$ | X O O O . O O . 1 , X X O . O , X . . |
$$ | O O . . . O X X . X X . X O X X . X . |
$$ | . . . . . O O X . . . X O O O X O . . |
$$ | . . . . . . . . . . . O . O . O . O . |
$$ ---------------------------------------[/go]


If black plays safe by taking N9 for himself and securing two eyes, white takes his profit in sente with F8 threatening E10.

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X . . . . X . . . . . . X . . . . . |
$$ | . O X X X X . O . X O X O X . . . . . |
$$ | . O O O X O O . O O . O O X . X . . . |
$$ | . X O . O O . . . X O . X O . . X . . |
$$ | X . X O X O . . . . . . X O . O O X . |
$$ | . X O O . . . . . . . . X O X X . . . |
$$ | . . . . . . . . . . . O X X O X X X . |
$$ | . X . O . . X . . O . O X . O . O . . |
$$ | . . X , 5 X . . O , X O O . O O X . . |
$$ | . X O . X . . . . . X X 2 X O X O O . |
$$ | . X X O . 3 . . . O X . X . O . O X . |
$$ | . X O . . . . . . O O X . X O O X . X |
$$ | . . . . . . . . . O X X X . O X X X . |
$$ | X X X . . . . . . O X O O O O . . . . |
$$ | X O O O . O O . 1 , X X O . O , X . . |
$$ | O O . . . O X X . X X . X O X X . X . |
$$ | . . . . . O O X . . . X O O O X O . . |
$$ | . . . . . . . . . . . O . O . O . O . |
$$ ---------------------------------------[/go]


Assuming that black defends against that, white continues grabbing territory like this:


Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X . . . . X . . . . . . X . . . . . |
$$ | . O X X X X . O . X O X O X . . . . . |
$$ | . O O O X O O . O O . O O X . X . . . |
$$ | . X O . O O . . . X O . X O . . X . . |
$$ | X . X O X O . . . . . . X O . O O X . |
$$ | . X O O . . . . . . . . X O X X . . . |
$$ | . . . . . . . 5 . . . O X X O X X X . |
$$ | . X . O . . X . . O . O X . O . O . . |
$$ | . . X , . X . . O , X O O . O O X . . |
$$ | . X O 4 X . . . . . X X 2 X O X O O . |
$$ | . X X O . 3 . . . O X . X . O . O X . |
$$ | . X O . . . . . . O O X . X O O X . X |
$$ | . . . . . . . . . O X X X . O X X X . |
$$ | X X X . . . . . . O X O O O O . . . . |
$$ | X O O O . O O . 1 , X X O . O , X . . |
$$ | O O . . . O X X . X X . X O X X . X . |
$$ | . . . . . O O X . . . X O O O X O . . |
$$ | . . . . . . . . . . . O . O . O . O . |
$$ ---------------------------------------[/go]

_________________
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207


This post by Joaz Banbeck was liked by: Gomoto
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group